Sand aerating device



Sept. 12, 1933. A. c. CHRISTENSEN I SAND AERATING DEVICE 3 Sheets-Sheet1 Filed NOV. 14, 1931 1 mm: mm

Sept, 12, 1933. A. c. CHRISTENSEN SAND AERATING DEVICE 3 Sheets-Sheet 2Filed NOV. 14, 1931 Zr'd 6. /2 as imwwzo p 1933. A. c. CHRISTENSEN1,926,083

SAND AERATING DEVICE Filed Nov. 14, 1931 3 Sheets-Sheet :5

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is in m; if H I l 5 Patented Sept. 12, 1933 UNITED STATES PATENT OFFICESAND AERATING DEVICE corporation of Illinois Application November 14,1931 Serial No. 574,937

7 Claims.

This invention relates to a sand aerating device that may be used with asand mulling machine to break up any lumps of sand issuing from themulling machine and thoroughly aerating the same, or that may be usedindependently thereof for breaking up lumps of sand, aerating the sameand putting the same in such a state of fineness that it may be readilyused for moulding purposes.

The invention comprises the novel .structure and combination of partshereinafter described and more particularly pointed out and defined inthe appended claims.

In the accompanying drawings which illustrate a preferred form ofthisinvention and in which similar reference numerals refer to similarfeatures, in the dififerent views:

Figure l is an elevational view of a sand mulling machine equipped witha sand'aerating device involving this invention.

Figure 2 is an enlarged vertical sectional view through the sandaerating device.

Figure 3 is an enlarged sectional view taken upon the line IIIIII ofFigure 2.

Figure 4 is a fragmentary and enlarged top plan View of the sandaerating rotor.

Figure 5 is an enlarged fragmentary sectional view taken upon the lineV-V of Figure 2 looking in the direction of the arrows.

Figure 6 is an elevational view of the sand aerating device illustratingits use independent of the sand mulling machine.

In the drawings there is shown a mulling machine comprising a mullingpan or casing 1 which is supported upon pedestals 2. The mullingmechanisms or rollers generally used are driven by a gear wheel 3 and abeveled pinion 4 meshing therewith and secured to a shaft 5 as is usualin the art. A sprocket wheel 6 is secured to the shaft 5 and a sprocketchain 7 trained over the sprocket wheel 6 drives a sprocket wheel 8secured upon a shaft 8 to which the aerating rotor is attached as willlater more fully appear.

The shaft 8 is journaled in a casing 9 which in Figures 1 to 5 is shownas attached to the casing of the mulling machine. As shown in Figure 3,an idler sprocket 10 which is mounted upon a bracket 11 secured to thebottom of the mulling pan may engage the sprocket chain for taking upany slack. It will of course be understood that the gear 10 may beadiustably mounted upon the bracket 11 for this purpose. The sand fromthe mulling machine may be admitted into the casing 9 through a suitablegate 12 (Figure 2) which upon the shaft 8. These discs 14 supportequally spaced rods 15 adjacent their periphery. In the constructionillustrated, it will be noted that the discs are provided with aperturesthrough which the rods extend. Sand scouring and aerating devices 16 aremounted upon the rods 15 in the manner shown in Figure 4. These aeratingand scouring devices are substantially Y-shaped with teeth l6 upon eachside. The apex of each device comprises a bearing 1'7 through which arod 15 passes, while the diverging arms of the Y- shaped devices areprovided with bearings 18 for receiving an adjacent shaft 15. It willaccordingly be noted that the connection of the aerating devices 16 withthe rods 15 brings the teeth 16 upon the top and bottom thereof. Theseaerating and scouring devices 16 are preferably mounted upon the rods 15side by side. In the present instance, only a pair has been illustratedside by side but it should be understood that the same may be multipliedas desired.

Means are provided in connection with the scouring and aerating devicesas they rotate with the spiders 14 upon the shaft 8 for breaking up andpulverizing any lumps of sand that may be discharged from the mullingmachine or that may be fed into the aerating casing. In the illustratedform of this invention, the means above mentioned consist of a series ofhammers or the like 19 which are freely journalled upon a rod 20 mountedin the upper portion of the casing 9. In referring to Figure 2 it willbe noted that the hammers 19 are provided with heads 21 which cooperatewith the sand scouring and aerating devices 16 for breaking up the lumpsof sand. The upper portions of the heads terminate in forwardlyprojecting rests 22 which engage a bar 23 which is provided upon itsends with arms 24 pivoted to the casing as indicated at 25. A screw 26is pivoted to one of the arms 24 and extends through the casing 19. Theouter end of the screw 26 is provided with a nut 27 that engages thecasing and that may be rotated for adjusting the bar 23 for raising orlowering the hammers 19 in order to vary the distance that they aresupported from the aerating devices 16. It should be particularly notedthat the hammers 19 are free to rise and fall in accordance with thelumps of sand passing between the same and the aerating devices.

In referring to Figure 2, it will be noted that the casing 9 is providedwith a swingable door or gate 28. When the gate 28 is in its full lineposition, the sand discharged from the mulling machine will be actedupon by the aerating devices. However, when the gate 28 is swungupwardly into dotted line position, the sand will escape through theopening without coming in contact with the aerating devices. Suitablestops 29 may be provided upon the casing 9 for supporting the gate 28 inits dotted line position.

The sand aerating device heretofore described in connection with amulling machine, may be used independently of such mulling machine foraerating and scouring sand as illustrated in Figure 6. In this figurethere is shown a modified casing 30 for supporting the shaft 8 thatcarries the sand aerating devices. A motor 31 is mounted upon the casing30 for rotating the shaft 8 together with the aerating devices. The sandis adapted to be fed into the casing by means of a feed belt 32 whichdischarges the sand through an inlet 33 in the top of the casing. Thebottom of the casing is provided with a suitable opening whereby thesand may be deposited upon a belt 34 for conveying the sand to anydesired destination. In the casing 30, there is a swingable gate 35shown in dotted lines to which a rod or cable 36 is connected wherebythe gate may be adjusted as indicated in dotted lines to regulate theforward discharge of the sand from the casing 30.

It will be appreciated that the double toothed aerating device will passthrough a considerable depth of sand and render the same suflicientlyfine-and free from lumps for moulding purposes. At the same time, theparticular formation of the sand aerating devices causes certain partsof the sand to flow in directions parallel to the shaft 8 and therebycauses a better agitation and better aeration thereof. At the same timethe sand aerating devices are sufliciently strong and substantial towithstand the severe usage to which they are adapted to be put. Withreference to Figure 4, it will be apparent that a pair of aeratingdevices side by side produce a zigzag double line of teeth producingthereby an aerating rotor having spaced zigzag teeth. It will be furtherapperciated that the use of the hammers 19 in cooperation with theaerating rotor will thoroughly pulverize any lumps of sand that mayoccur.

I am aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not purposelimiting the patent granted hereon otherwise than is necessitated by theprior art.

I claim as my invention:

1. In a sand aerating device, a shaft, a pair of spaced spiders keyedupon said shaft, rods extending between said spiders and Y-shapedaerating devices mounted upon said rods and having exterior and interiorteeth.

2. In a sand mulling machine, a rotor comprising a shaft, spaced spidersupon said shaft, spaced rods supported by said spiders, and Y-shapedelements having their apices mounted upon a rod and their diverging armsmounted upon an adjacent rod.

3. In a sand aerating machine, a casing, a rotor in said casing, aseries of hammers pivotally mounted upon said casing and having portionscooperating with said rotor, each of said portions having an outwardlyollset shoulder, a bar in said casing upon which each shoulder rests andmeans for pivoting said bar to said casing for adjustment toward andfrom said rotor.

4. In a sand aerating machine, a casing, a rotor mounted in said casing,a rod mounted upon said casing above said rotor, a series of hammerspivotally mounted upon said rod, a bar engaging the free ends of saidhammers, arms pivoted to said casing and attached to said bar, a boltattached to an arm and extending through said casing and a nut threadedupon said bolt for sustaining said bar in any adjusted position, saidhammers having downwardly directed heads between said rod and bar.

5. In a sand aerating device, a casing, a sand aerating rotor journaledin said casing, said rotor comprising spaced members extendingsubstantially parallel to the axes thereof, said members having alongitudinally directed zig-zag formation and teeth upon their outer andinner edges.

6. In a sand aerating machine, a rotor comprising a plurality of spacedmembers extending in the direction of the axis of the rotor, each memberhaving a longitudinally directed zig-zag formation and teeth upon one ofits edges.

7. In a sand aerating machine, a rotor having spaced peripheral means,extending in zig-zag formation in the direction of the axis of therotor, said means having outer and inner toothed surfaces.

ALFRED C. CHRISTENSEN.

